Angie Illerbrun had no idea her daughter Olivia was having trouble seeing until she had her own eyes checked and the optometrist suggested he take a look at the toddler's eyes as well.
Scientists have, for the first time, found how X-rays and radioactive particles cause cancer in humans by damaging DNA, a finding that may lead to more effective treatments for tumours caused by radiation.
A team of researchers, including one of Indian orgin, has found that Zika virus can live in the eyes and have identified genetic material from the virus in tears of mice.
Scientists trying to predict the future path of Zika say that 2.6 billion people living in parts of Asia and Africa could be at risk of infection, based on a new analysis of travel, climate and mosquito patterns in those regions.